| /* |
| * inet and unix socket functions for qemu |
| * |
| * (c) 2008 Gerd Hoffmann <kraxel@redhat.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; under version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * Contributions after 2012-01-13 are licensed under the terms of the |
| * GNU GPL, version 2 or (at your option) any later version. |
| */ |
| #include "qemu/osdep.h" |
| |
| #ifdef CONFIG_AF_VSOCK |
| #include <linux/vm_sockets.h> |
| #endif /* CONFIG_AF_VSOCK */ |
| |
| #include "monitor/monitor.h" |
| #include "qapi/clone-visitor.h" |
| #include "qapi/error.h" |
| #include "qapi/qapi-visit-sockets.h" |
| #include "qemu/sockets.h" |
| #include "qemu/main-loop.h" |
| #include "qapi/qobject-input-visitor.h" |
| #include "qapi/qobject-output-visitor.h" |
| #include "qemu/cutils.h" |
| #include "trace.h" |
| |
| #ifndef AI_ADDRCONFIG |
| # define AI_ADDRCONFIG 0 |
| #endif |
| |
| #ifndef AI_V4MAPPED |
| # define AI_V4MAPPED 0 |
| #endif |
| |
| #ifndef AI_NUMERICSERV |
| # define AI_NUMERICSERV 0 |
| #endif |
| |
| |
| static int inet_getport(struct addrinfo *e) |
| { |
| struct sockaddr_in *i4; |
| struct sockaddr_in6 *i6; |
| |
| switch (e->ai_family) { |
| case PF_INET6: |
| i6 = (void*)e->ai_addr; |
| return ntohs(i6->sin6_port); |
| case PF_INET: |
| i4 = (void*)e->ai_addr; |
| return ntohs(i4->sin_port); |
| default: |
| return 0; |
| } |
| } |
| |
| static void inet_setport(struct addrinfo *e, int port) |
| { |
| struct sockaddr_in *i4; |
| struct sockaddr_in6 *i6; |
| |
| switch (e->ai_family) { |
| case PF_INET6: |
| i6 = (void*)e->ai_addr; |
| i6->sin6_port = htons(port); |
| break; |
| case PF_INET: |
| i4 = (void*)e->ai_addr; |
| i4->sin_port = htons(port); |
| break; |
| } |
| } |
| |
| NetworkAddressFamily inet_netfamily(int family) |
| { |
| switch (family) { |
| case PF_INET6: return NETWORK_ADDRESS_FAMILY_IPV6; |
| case PF_INET: return NETWORK_ADDRESS_FAMILY_IPV4; |
| case PF_UNIX: return NETWORK_ADDRESS_FAMILY_UNIX; |
| #ifdef CONFIG_AF_VSOCK |
| case PF_VSOCK: return NETWORK_ADDRESS_FAMILY_VSOCK; |
| #endif /* CONFIG_AF_VSOCK */ |
| } |
| return NETWORK_ADDRESS_FAMILY_UNKNOWN; |
| } |
| |
| bool fd_is_socket(int fd) |
| { |
| int optval; |
| socklen_t optlen = sizeof(optval); |
| return !getsockopt(fd, SOL_SOCKET, SO_TYPE, &optval, &optlen); |
| } |
| |
| |
| /* |
| * Matrix we're trying to apply |
| * |
| * ipv4 ipv6 family |
| * - - PF_UNSPEC |
| * - f PF_INET |
| * - t PF_INET6 |
| * f - PF_INET6 |
| * f f <error> |
| * f t PF_INET6 |
| * t - PF_INET |
| * t f PF_INET |
| * t t PF_INET6/PF_UNSPEC |
| * |
| * NB, this matrix is only about getting the necessary results |
| * from getaddrinfo(). Some of the cases require further work |
| * after reading results from getaddrinfo in order to fully |
| * apply the logic the end user wants. |
| * |
| * In the first and last cases, we must set IPV6_V6ONLY=0 |
| * when binding, to allow a single listener to potentially |
| * accept both IPv4+6 addresses. |
| */ |
| int inet_ai_family_from_address(InetSocketAddress *addr, |
| Error **errp) |
| { |
| if (addr->has_ipv6 && addr->has_ipv4 && |
| !addr->ipv6 && !addr->ipv4) { |
| error_setg(errp, "Cannot disable IPv4 and IPv6 at same time"); |
| return PF_UNSPEC; |
| } |
| if ((addr->has_ipv6 && addr->ipv6) && (addr->has_ipv4 && addr->ipv4)) { |
| /* |
| * Some backends can only do a single listener. In that case |
| * we want empty hostname to resolve to "::" and then use the |
| * flag IPV6_V6ONLY==0 to get both protocols on 1 socket. This |
| * doesn't work for addresses other than "", so they're just |
| * inevitably broken until multiple listeners can be used, |
| * and thus we honour getaddrinfo automatic protocol detection |
| * Once all backends do multi-listener, remove the PF_INET6 |
| * branch entirely. |
| */ |
| if (!addr->host || g_str_equal(addr->host, "")) { |
| return PF_INET6; |
| } else { |
| return PF_UNSPEC; |
| } |
| } |
| if ((addr->has_ipv6 && addr->ipv6) || (addr->has_ipv4 && !addr->ipv4)) { |
| return PF_INET6; |
| } |
| if ((addr->has_ipv4 && addr->ipv4) || (addr->has_ipv6 && !addr->ipv6)) { |
| return PF_INET; |
| } |
| return PF_UNSPEC; |
| } |
| |
| static int create_fast_reuse_socket(struct addrinfo *e) |
| { |
| int slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol); |
| if (slisten < 0) { |
| return -1; |
| } |
| socket_set_fast_reuse(slisten); |
| return slisten; |
| } |
| |
| static int try_bind(int socket, InetSocketAddress *saddr, struct addrinfo *e) |
| { |
| #ifndef IPV6_V6ONLY |
| return bind(socket, e->ai_addr, e->ai_addrlen); |
| #else |
| /* |
| * Deals with first & last cases in matrix in comment |
| * for inet_ai_family_from_address(). |
| */ |
| int v6only = |
| ((!saddr->has_ipv4 && !saddr->has_ipv6) || |
| (saddr->has_ipv4 && saddr->ipv4 && |
| saddr->has_ipv6 && saddr->ipv6)) ? 0 : 1; |
| int stat; |
| |
| rebind: |
| if (e->ai_family == PF_INET6) { |
| setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, &v6only, |
| sizeof(v6only)); |
| } |
| |
| stat = bind(socket, e->ai_addr, e->ai_addrlen); |
| if (!stat) { |
| return 0; |
| } |
| |
| /* If we got EADDRINUSE from an IPv6 bind & v6only is unset, |
| * it could be that the IPv4 port is already claimed, so retry |
| * with v6only set |
| */ |
| if (e->ai_family == PF_INET6 && errno == EADDRINUSE && !v6only) { |
| v6only = 1; |
| goto rebind; |
| } |
| return stat; |
| #endif |
| } |
| |
| static int inet_listen_saddr(InetSocketAddress *saddr, |
| int port_offset, |
| int num, |
| Error **errp) |
| { |
| ERRP_GUARD(); |
| struct addrinfo ai, *res, *e; |
| char port[33]; |
| char uaddr[INET6_ADDRSTRLEN+1]; |
| char uport[33]; |
| int rc, port_min, port_max, p; |
| int slisten = -1; |
| int saved_errno = 0; |
| bool socket_created = false; |
| |
| if (saddr->keep_alive) { |
| error_setg(errp, "keep-alive option is not supported for passive " |
| "sockets"); |
| return -1; |
| } |
| |
| memset(&ai,0, sizeof(ai)); |
| ai.ai_flags = AI_PASSIVE; |
| if (saddr->has_numeric && saddr->numeric) { |
| ai.ai_flags |= AI_NUMERICHOST | AI_NUMERICSERV; |
| } |
| ai.ai_socktype = SOCK_STREAM; |
| ai.ai_family = inet_ai_family_from_address(saddr, errp); |
| if (*errp) { |
| return -1; |
| } |
| |
| if (saddr->host == NULL) { |
| error_setg(errp, "host not specified"); |
| return -1; |
| } |
| if (saddr->port != NULL) { |
| pstrcpy(port, sizeof(port), saddr->port); |
| } else { |
| port[0] = '\0'; |
| } |
| |
| /* lookup */ |
| if (port_offset) { |
| uint64_t baseport; |
| if (strlen(port) == 0) { |
| error_setg(errp, "port not specified"); |
| return -1; |
| } |
| if (parse_uint_full(port, 10, &baseport) < 0) { |
| error_setg(errp, "can't convert to a number: %s", port); |
| return -1; |
| } |
| if (baseport > 65535 || |
| baseport + port_offset > 65535) { |
| error_setg(errp, "port %s out of range", port); |
| return -1; |
| } |
| snprintf(port, sizeof(port), "%d", (int)baseport + port_offset); |
| } |
| rc = getaddrinfo(strlen(saddr->host) ? saddr->host : NULL, |
| strlen(port) ? port : NULL, &ai, &res); |
| if (rc != 0) { |
| error_setg(errp, "address resolution failed for %s:%s: %s", |
| saddr->host, port, gai_strerror(rc)); |
| return -1; |
| } |
| |
| /* create socket + bind/listen */ |
| for (e = res; e != NULL; e = e->ai_next) { |
| #ifdef HAVE_IPPROTO_MPTCP |
| if (saddr->has_mptcp && saddr->mptcp) { |
| e->ai_protocol = IPPROTO_MPTCP; |
| } |
| #endif |
| getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen, |
| uaddr,INET6_ADDRSTRLEN,uport,32, |
| NI_NUMERICHOST | NI_NUMERICSERV); |
| |
| port_min = inet_getport(e); |
| port_max = saddr->has_to ? saddr->to + port_offset : port_min; |
| for (p = port_min; p <= port_max; p++) { |
| inet_setport(e, p); |
| |
| slisten = create_fast_reuse_socket(e); |
| if (slisten < 0) { |
| /* First time we expect we might fail to create the socket |
| * eg if 'e' has AF_INET6 but ipv6 kmod is not loaded. |
| * Later iterations should always succeed if first iteration |
| * worked though, so treat that as fatal. |
| */ |
| if (p == port_min) { |
| continue; |
| } else { |
| error_setg_errno(errp, errno, |
| "Failed to recreate failed listening socket"); |
| goto listen_failed; |
| } |
| } |
| socket_created = true; |
| |
| rc = try_bind(slisten, saddr, e); |
| if (rc < 0) { |
| if (errno != EADDRINUSE) { |
| error_setg_errno(errp, errno, "Failed to bind socket"); |
| goto listen_failed; |
| } |
| } else { |
| if (!listen(slisten, num)) { |
| goto listen_ok; |
| } |
| if (errno != EADDRINUSE) { |
| error_setg_errno(errp, errno, "Failed to listen on socket"); |
| goto listen_failed; |
| } |
| } |
| /* Someone else managed to bind to the same port and beat us |
| * to listen on it! Socket semantics does not allow us to |
| * recover from this situation, so we need to recreate the |
| * socket to allow bind attempts for subsequent ports: |
| */ |
| close(slisten); |
| slisten = -1; |
| } |
| } |
| error_setg_errno(errp, errno, |
| socket_created ? |
| "Failed to find an available port" : |
| "Failed to create a socket"); |
| listen_failed: |
| saved_errno = errno; |
| if (slisten >= 0) { |
| close(slisten); |
| } |
| freeaddrinfo(res); |
| errno = saved_errno; |
| return -1; |
| |
| listen_ok: |
| freeaddrinfo(res); |
| return slisten; |
| } |
| |
| #ifdef _WIN32 |
| #define QEMU_SOCKET_RC_INPROGRESS(rc) \ |
| ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY) |
| #else |
| #define QEMU_SOCKET_RC_INPROGRESS(rc) \ |
| ((rc) == -EINPROGRESS) |
| #endif |
| |
| static int inet_connect_addr(const InetSocketAddress *saddr, |
| struct addrinfo *addr, Error **errp) |
| { |
| int sock, rc; |
| |
| sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol); |
| if (sock < 0) { |
| error_setg_errno(errp, errno, "Failed to create socket family %d", |
| addr->ai_family); |
| return -1; |
| } |
| socket_set_fast_reuse(sock); |
| |
| /* connect to peer */ |
| do { |
| rc = 0; |
| if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) { |
| rc = -errno; |
| } |
| } while (rc == -EINTR); |
| |
| if (rc < 0) { |
| error_setg_errno(errp, errno, "Failed to connect to '%s:%s'", |
| saddr->host, saddr->port); |
| close(sock); |
| return -1; |
| } |
| |
| return sock; |
| } |
| |
| static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr, |
| Error **errp) |
| { |
| ERRP_GUARD(); |
| struct addrinfo ai, *res; |
| int rc; |
| static int useV4Mapped = 1; |
| |
| memset(&ai, 0, sizeof(ai)); |
| |
| ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG; |
| if (qatomic_read(&useV4Mapped)) { |
| ai.ai_flags |= AI_V4MAPPED; |
| } |
| ai.ai_socktype = SOCK_STREAM; |
| ai.ai_family = inet_ai_family_from_address(saddr, errp); |
| if (*errp) { |
| return NULL; |
| } |
| |
| if (saddr->host == NULL || saddr->port == NULL) { |
| error_setg(errp, "host and/or port not specified"); |
| return NULL; |
| } |
| |
| /* lookup */ |
| rc = getaddrinfo(saddr->host, saddr->port, &ai, &res); |
| |
| /* At least FreeBSD and OS-X 10.6 declare AI_V4MAPPED but |
| * then don't implement it in their getaddrinfo(). Detect |
| * this and retry without the flag since that's preferable |
| * to a fatal error |
| */ |
| if (rc == EAI_BADFLAGS && |
| (ai.ai_flags & AI_V4MAPPED)) { |
| qatomic_set(&useV4Mapped, 0); |
| ai.ai_flags &= ~AI_V4MAPPED; |
| rc = getaddrinfo(saddr->host, saddr->port, &ai, &res); |
| } |
| if (rc != 0) { |
| error_setg(errp, "address resolution failed for %s:%s: %s", |
| saddr->host, saddr->port, gai_strerror(rc)); |
| return NULL; |
| } |
| return res; |
| } |
| |
| /** |
| * Create a socket and connect it to an address. |
| * |
| * @saddr: Inet socket address specification |
| * @errp: set on error |
| * |
| * Returns: -1 on error, file descriptor on success. |
| */ |
| int inet_connect_saddr(InetSocketAddress *saddr, Error **errp) |
| { |
| Error *local_err = NULL; |
| struct addrinfo *res, *e; |
| int sock = -1; |
| |
| res = inet_parse_connect_saddr(saddr, errp); |
| if (!res) { |
| return -1; |
| } |
| |
| for (e = res; e != NULL; e = e->ai_next) { |
| error_free(local_err); |
| local_err = NULL; |
| |
| #ifdef HAVE_IPPROTO_MPTCP |
| if (saddr->has_mptcp && saddr->mptcp) { |
| e->ai_protocol = IPPROTO_MPTCP; |
| } |
| #endif |
| |
| sock = inet_connect_addr(saddr, e, &local_err); |
| if (sock >= 0) { |
| break; |
| } |
| } |
| |
| freeaddrinfo(res); |
| |
| if (sock < 0) { |
| error_propagate(errp, local_err); |
| return sock; |
| } |
| |
| if (saddr->keep_alive) { |
| int val = 1; |
| int ret = setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, |
| &val, sizeof(val)); |
| |
| if (ret < 0) { |
| error_setg_errno(errp, errno, "Unable to set KEEPALIVE"); |
| close(sock); |
| return -1; |
| } |
| } |
| |
| return sock; |
| } |
| |
| static int inet_dgram_saddr(InetSocketAddress *sraddr, |
| InetSocketAddress *sladdr, |
| Error **errp) |
| { |
| ERRP_GUARD(); |
| struct addrinfo ai, *peer = NULL, *local = NULL; |
| const char *addr; |
| const char *port; |
| int sock = -1, rc; |
| |
| /* lookup peer addr */ |
| memset(&ai,0, sizeof(ai)); |
| ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG; |
| ai.ai_socktype = SOCK_DGRAM; |
| ai.ai_family = inet_ai_family_from_address(sraddr, errp); |
| if (*errp) { |
| goto err; |
| } |
| |
| addr = sraddr->host; |
| port = sraddr->port; |
| if (addr == NULL || strlen(addr) == 0) { |
| addr = "localhost"; |
| } |
| if (port == NULL || strlen(port) == 0) { |
| error_setg(errp, "remote port not specified"); |
| goto err; |
| } |
| |
| if ((rc = getaddrinfo(addr, port, &ai, &peer)) != 0) { |
| error_setg(errp, "address resolution failed for %s:%s: %s", addr, port, |
| gai_strerror(rc)); |
| goto err; |
| } |
| |
| /* lookup local addr */ |
| memset(&ai,0, sizeof(ai)); |
| ai.ai_flags = AI_PASSIVE; |
| ai.ai_family = peer->ai_family; |
| ai.ai_socktype = SOCK_DGRAM; |
| |
| if (sladdr) { |
| addr = sladdr->host; |
| port = sladdr->port; |
| if (addr == NULL || strlen(addr) == 0) { |
| addr = NULL; |
| } |
| if (!port || strlen(port) == 0) { |
| port = "0"; |
| } |
| } else { |
| addr = NULL; |
| port = "0"; |
| } |
| |
| if ((rc = getaddrinfo(addr, port, &ai, &local)) != 0) { |
| error_setg(errp, "address resolution failed for %s:%s: %s", addr, port, |
| gai_strerror(rc)); |
| goto err; |
| } |
| |
| /* create socket */ |
| sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol); |
| if (sock < 0) { |
| error_setg_errno(errp, errno, "Failed to create socket family %d", |
| peer->ai_family); |
| goto err; |
| } |
| socket_set_fast_reuse(sock); |
| |
| /* bind socket */ |
| if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) { |
| error_setg_errno(errp, errno, "Failed to bind socket"); |
| goto err; |
| } |
| |
| /* connect to peer */ |
| if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) { |
| error_setg_errno(errp, errno, "Failed to connect to '%s:%s'", |
| addr, port); |
| goto err; |
| } |
| |
| freeaddrinfo(local); |
| freeaddrinfo(peer); |
| return sock; |
| |
| err: |
| if (sock != -1) { |
| close(sock); |
| } |
| if (local) { |
| freeaddrinfo(local); |
| } |
| if (peer) { |
| freeaddrinfo(peer); |
| } |
| |
| return -1; |
| } |
| |
| /* compatibility wrapper */ |
| static int inet_parse_flag(const char *flagname, const char *optstr, bool *val, |
| Error **errp) |
| { |
| char *end; |
| size_t len; |
| |
| end = strstr(optstr, ","); |
| if (end) { |
| if (end[1] == ',') { /* Reject 'ipv6=on,,foo' */ |
| error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr); |
| return -1; |
| } |
| len = end - optstr; |
| } else { |
| len = strlen(optstr); |
| } |
| if (len == 0 || (len == 3 && strncmp(optstr, "=on", len) == 0)) { |
| *val = true; |
| } else if (len == 4 && strncmp(optstr, "=off", len) == 0) { |
| *val = false; |
| } else { |
| error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr); |
| return -1; |
| } |
| return 0; |
| } |
| |
| int inet_parse(InetSocketAddress *addr, const char *str, Error **errp) |
| { |
| const char *optstr, *h; |
| char host[65]; |
| char port[33]; |
| int to; |
| int pos; |
| char *begin; |
| |
| memset(addr, 0, sizeof(*addr)); |
| |
| /* parse address */ |
| if (str[0] == ':') { |
| /* no host given */ |
| host[0] = '\0'; |
| if (sscanf(str, ":%32[^,]%n", port, &pos) != 1) { |
| error_setg(errp, "error parsing port in address '%s'", str); |
| return -1; |
| } |
| } else if (str[0] == '[') { |
| /* IPv6 addr */ |
| if (sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos) != 2) { |
| error_setg(errp, "error parsing IPv6 address '%s'", str); |
| return -1; |
| } |
| } else { |
| /* hostname or IPv4 addr */ |
| if (sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos) != 2) { |
| error_setg(errp, "error parsing address '%s'", str); |
| return -1; |
| } |
| } |
| |
| addr->host = g_strdup(host); |
| addr->port = g_strdup(port); |
| |
| /* parse options */ |
| optstr = str + pos; |
| h = strstr(optstr, ",to="); |
| if (h) { |
| h += 4; |
| if (sscanf(h, "%d%n", &to, &pos) != 1 || |
| (h[pos] != '\0' && h[pos] != ',')) { |
| error_setg(errp, "error parsing to= argument"); |
| return -1; |
| } |
| addr->has_to = true; |
| addr->to = to; |
| } |
| begin = strstr(optstr, ",ipv4"); |
| if (begin) { |
| if (inet_parse_flag("ipv4", begin + 5, &addr->ipv4, errp) < 0) { |
| return -1; |
| } |
| addr->has_ipv4 = true; |
| } |
| begin = strstr(optstr, ",ipv6"); |
| if (begin) { |
| if (inet_parse_flag("ipv6", begin + 5, &addr->ipv6, errp) < 0) { |
| return -1; |
| } |
| addr->has_ipv6 = true; |
| } |
| begin = strstr(optstr, ",keep-alive"); |
| if (begin) { |
| if (inet_parse_flag("keep-alive", begin + strlen(",keep-alive"), |
| &addr->keep_alive, errp) < 0) |
| { |
| return -1; |
| } |
| addr->has_keep_alive = true; |
| } |
| #ifdef HAVE_IPPROTO_MPTCP |
| begin = strstr(optstr, ",mptcp"); |
| if (begin) { |
| if (inet_parse_flag("mptcp", begin + strlen(",mptcp"), |
| &addr->mptcp, errp) < 0) |
| { |
| return -1; |
| } |
| addr->has_mptcp = true; |
| } |
| #endif |
| return 0; |
| } |
| |
| |
| /** |
| * Create a blocking socket and connect it to an address. |
| * |
| * @str: address string |
| * @errp: set in case of an error |
| * |
| * Returns -1 in case of error, file descriptor on success |
| **/ |
| int inet_connect(const char *str, Error **errp) |
| { |
| int sock = -1; |
| InetSocketAddress *addr = g_new(InetSocketAddress, 1); |
| |
| if (!inet_parse(addr, str, errp)) { |
| sock = inet_connect_saddr(addr, errp); |
| } |
| qapi_free_InetSocketAddress(addr); |
| return sock; |
| } |
| |
| #ifdef CONFIG_AF_VSOCK |
| static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr, |
| struct sockaddr_vm *svm, |
| Error **errp) |
| { |
| uint64_t val; |
| |
| memset(svm, 0, sizeof(*svm)); |
| svm->svm_family = AF_VSOCK; |
| |
| if (parse_uint_full(vaddr->cid, 10, &val) < 0 || |
| val > UINT32_MAX) { |
| error_setg(errp, "Failed to parse cid '%s'", vaddr->cid); |
| return false; |
| } |
| svm->svm_cid = val; |
| |
| if (parse_uint_full(vaddr->port, 10, &val) < 0 || |
| val > UINT32_MAX) { |
| error_setg(errp, "Failed to parse port '%s'", vaddr->port); |
| return false; |
| } |
| svm->svm_port = val; |
| |
| return true; |
| } |
| |
| static int vsock_connect_addr(const VsockSocketAddress *vaddr, |
| const struct sockaddr_vm *svm, Error **errp) |
| { |
| int sock, rc; |
| |
| sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0); |
| if (sock < 0) { |
| error_setg_errno(errp, errno, "Failed to create socket family %d", |
| AF_VSOCK); |
| return -1; |
| } |
| |
| /* connect to peer */ |
| do { |
| rc = 0; |
| if (connect(sock, (const struct sockaddr *)svm, sizeof(*svm)) < 0) { |
| rc = -errno; |
| } |
| } while (rc == -EINTR); |
| |
| if (rc < 0) { |
| error_setg_errno(errp, errno, "Failed to connect to '%s:%s'", |
| vaddr->cid, vaddr->port); |
| close(sock); |
| return -1; |
| } |
| |
| return sock; |
| } |
| |
| static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp) |
| { |
| struct sockaddr_vm svm; |
| |
| if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) { |
| return -1; |
| } |
| |
| return vsock_connect_addr(vaddr, &svm, errp); |
| } |
| |
| static int vsock_listen_saddr(VsockSocketAddress *vaddr, |
| int num, |
| Error **errp) |
| { |
| struct sockaddr_vm svm; |
| int slisten; |
| |
| if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) { |
| return -1; |
| } |
| |
| slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0); |
| if (slisten < 0) { |
| error_setg_errno(errp, errno, "Failed to create socket"); |
| return -1; |
| } |
| |
| if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) { |
| error_setg_errno(errp, errno, "Failed to bind socket"); |
| close(slisten); |
| return -1; |
| } |
| |
| if (listen(slisten, num) != 0) { |
| error_setg_errno(errp, errno, "Failed to listen on socket"); |
| close(slisten); |
| return -1; |
| } |
| return slisten; |
| } |
| |
| static int vsock_parse(VsockSocketAddress *addr, const char *str, |
| Error **errp) |
| { |
| char cid[33]; |
| char port[33]; |
| int n; |
| |
| if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) { |
| error_setg(errp, "error parsing address '%s'", str); |
| return -1; |
| } |
| if (str[n] != '\0') { |
| error_setg(errp, "trailing characters in address '%s'", str); |
| return -1; |
| } |
| |
| addr->cid = g_strdup(cid); |
| addr->port = g_strdup(port); |
| return 0; |
| } |
| #else |
| static void vsock_unsupported(Error **errp) |
| { |
| error_setg(errp, "socket family AF_VSOCK unsupported"); |
| } |
| |
| static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp) |
| { |
| vsock_unsupported(errp); |
| return -1; |
| } |
| |
| static int vsock_listen_saddr(VsockSocketAddress *vaddr, |
| int num, |
| Error **errp) |
| { |
| vsock_unsupported(errp); |
| return -1; |
| } |
| |
| static int vsock_parse(VsockSocketAddress *addr, const char *str, |
| Error **errp) |
| { |
| vsock_unsupported(errp); |
| return -1; |
| } |
| #endif /* CONFIG_AF_VSOCK */ |
| |
| static bool saddr_is_abstract(UnixSocketAddress *saddr) |
| { |
| #ifdef CONFIG_LINUX |
| return saddr->abstract; |
| #else |
| return false; |
| #endif |
| } |
| |
| static bool saddr_is_tight(UnixSocketAddress *saddr) |
| { |
| #ifdef CONFIG_LINUX |
| return !saddr->has_tight || saddr->tight; |
| #else |
| return false; |
| #endif |
| } |
| |
| static int unix_listen_saddr(UnixSocketAddress *saddr, |
| int num, |
| Error **errp) |
| { |
| bool abstract = saddr_is_abstract(saddr); |
| struct sockaddr_un un; |
| int sock, fd; |
| char *pathbuf = NULL; |
| const char *path; |
| size_t pathlen; |
| size_t addrlen; |
| |
| sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0); |
| if (sock < 0) { |
| error_setg_errno(errp, errno, "Failed to create Unix socket"); |
| return -1; |
| } |
| |
| if (saddr->path[0] || abstract) { |
| path = saddr->path; |
| } else { |
| path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", |
| g_get_tmp_dir()); |
| } |
| |
| pathlen = strlen(path); |
| if (pathlen > sizeof(un.sun_path) || |
| (abstract && pathlen > (sizeof(un.sun_path) - 1))) { |
| error_setg(errp, "UNIX socket path '%s' is too long", path); |
| error_append_hint(errp, "Path must be less than %zu bytes\n", |
| abstract ? sizeof(un.sun_path) - 1 : |
| sizeof(un.sun_path)); |
| goto err; |
| } |
| |
| if (pathbuf != NULL) { |
| /* |
| * This dummy fd usage silences the mktemp() insecure warning. |
| * Using mkstemp() doesn't make things more secure here |
| * though. bind() complains about existing files, so we have |
| * to unlink first and thus re-open the race window. The |
| * worst case possible is bind() failing, i.e. a DoS attack. |
| */ |
| fd = mkstemp(pathbuf); |
| if (fd < 0) { |
| error_setg_errno(errp, errno, |
| "Failed to make a temporary socket %s", pathbuf); |
| goto err; |
| } |
| close(fd); |
| } |
| |
| if (!abstract && unlink(path) < 0 && errno != ENOENT) { |
| error_setg_errno(errp, errno, |
| "Failed to unlink socket %s", path); |
| goto err; |
| } |
| |
| memset(&un, 0, sizeof(un)); |
| un.sun_family = AF_UNIX; |
| addrlen = sizeof(un); |
| |
| if (abstract) { |
| un.sun_path[0] = '\0'; |
| memcpy(&un.sun_path[1], path, pathlen); |
| if (saddr_is_tight(saddr)) { |
| addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen; |
| } |
| } else { |
| memcpy(un.sun_path, path, pathlen); |
| } |
| |
| if (bind(sock, (struct sockaddr *) &un, addrlen) < 0) { |
| error_setg_errno(errp, errno, "Failed to bind socket to %s", path); |
| goto err; |
| } |
| if (listen(sock, num) < 0) { |
| error_setg_errno(errp, errno, "Failed to listen on socket"); |
| goto err; |
| } |
| |
| g_free(pathbuf); |
| return sock; |
| |
| err: |
| g_free(pathbuf); |
| close(sock); |
| return -1; |
| } |
| |
| static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp) |
| { |
| bool abstract = saddr_is_abstract(saddr); |
| struct sockaddr_un un; |
| int sock, rc; |
| size_t pathlen; |
| size_t addrlen; |
| |
| if (saddr->path == NULL) { |
| error_setg(errp, "unix connect: no path specified"); |
| return -1; |
| } |
| |
| sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0); |
| if (sock < 0) { |
| error_setg_errno(errp, errno, "Failed to create socket"); |
| return -1; |
| } |
| |
| pathlen = strlen(saddr->path); |
| if (pathlen > sizeof(un.sun_path) || |
| (abstract && pathlen > (sizeof(un.sun_path) - 1))) { |
| error_setg(errp, "UNIX socket path '%s' is too long", saddr->path); |
| error_append_hint(errp, "Path must be less than %zu bytes\n", |
| abstract ? sizeof(un.sun_path) - 1 : |
| sizeof(un.sun_path)); |
| goto err; |
| } |
| |
| memset(&un, 0, sizeof(un)); |
| un.sun_family = AF_UNIX; |
| addrlen = sizeof(un); |
| |
| if (abstract) { |
| un.sun_path[0] = '\0'; |
| memcpy(&un.sun_path[1], saddr->path, pathlen); |
| if (saddr_is_tight(saddr)) { |
| addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen; |
| } |
| } else { |
| memcpy(un.sun_path, saddr->path, pathlen); |
| } |
| /* connect to peer */ |
| do { |
| rc = 0; |
| if (connect(sock, (struct sockaddr *) &un, addrlen) < 0) { |
| rc = -errno; |
| } |
| } while (rc == -EINTR); |
| |
| if (rc < 0) { |
| error_setg_errno(errp, -rc, "Failed to connect to '%s'", |
| saddr->path); |
| goto err; |
| } |
| |
| return sock; |
| |
| err: |
| close(sock); |
| return -1; |
| } |
| |
| /* compatibility wrapper */ |
| int unix_listen(const char *str, Error **errp) |
| { |
| UnixSocketAddress *saddr; |
| int sock; |
| |
| saddr = g_new0(UnixSocketAddress, 1); |
| saddr->path = g_strdup(str); |
| sock = unix_listen_saddr(saddr, 1, errp); |
| qapi_free_UnixSocketAddress(saddr); |
| return sock; |
| } |
| |
| int unix_connect(const char *path, Error **errp) |
| { |
| UnixSocketAddress *saddr; |
| int sock; |
| |
| saddr = g_new0(UnixSocketAddress, 1); |
| saddr->path = g_strdup(path); |
| sock = unix_connect_saddr(saddr, errp); |
| qapi_free_UnixSocketAddress(saddr); |
| return sock; |
| } |
| |
| char *socket_uri(SocketAddress *addr) |
| { |
| switch (addr->type) { |
| case SOCKET_ADDRESS_TYPE_INET: |
| return g_strdup_printf("tcp:%s:%s", |
| addr->u.inet.host, |
| addr->u.inet.port); |
| case SOCKET_ADDRESS_TYPE_UNIX: |
| return g_strdup_printf("unix:%s", |
| addr->u.q_unix.path); |
| case SOCKET_ADDRESS_TYPE_FD: |
| return g_strdup_printf("fd:%s", addr->u.fd.str); |
| case SOCKET_ADDRESS_TYPE_VSOCK: |
| return g_strdup_printf("vsock:%s:%s", |
| addr->u.vsock.cid, |
| addr->u.vsock.port); |
| default: |
| return g_strdup("unknown address type"); |
| } |
| } |
| |
| SocketAddress *socket_parse(const char *str, Error **errp) |
| { |
| SocketAddress *addr; |
| |
| addr = g_new0(SocketAddress, 1); |
| if (strstart(str, "unix:", NULL)) { |
| if (str[5] == '\0') { |
| error_setg(errp, "invalid Unix socket address"); |
| goto fail; |
| } else { |
| addr->type = SOCKET_ADDRESS_TYPE_UNIX; |
| addr->u.q_unix.path = g_strdup(str + 5); |
| } |
| } else if (strstart(str, "fd:", NULL)) { |
| if (str[3] == '\0') { |
| error_setg(errp, "invalid file descriptor address"); |
| goto fail; |
| } else { |
| addr->type = SOCKET_ADDRESS_TYPE_FD; |
| addr->u.fd.str = g_strdup(str + 3); |
| } |
| } else if (strstart(str, "vsock:", NULL)) { |
| addr->type = SOCKET_ADDRESS_TYPE_VSOCK; |
| if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) { |
| goto fail; |
| } |
| } else if (strstart(str, "tcp:", NULL)) { |
| addr->type = SOCKET_ADDRESS_TYPE_INET; |
| if (inet_parse(&addr->u.inet, str + strlen("tcp:"), errp)) { |
| goto fail; |
| } |
| } else { |
| addr->type = SOCKET_ADDRESS_TYPE_INET; |
| if (inet_parse(&addr->u.inet, str, errp)) { |
| goto fail; |
| } |
| } |
| return addr; |
| |
| fail: |
| qapi_free_SocketAddress(addr); |
| return NULL; |
| } |
| |
| static int socket_get_fd(const char *fdstr, Error **errp) |
| { |
| Monitor *cur_mon = monitor_cur(); |
| int fd; |
| if (cur_mon) { |
| fd = monitor_get_fd(cur_mon, fdstr, errp); |
| if (fd < 0) { |
| return -1; |
| } |
| } else { |
| if (qemu_strtoi(fdstr, NULL, 10, &fd) < 0) { |
| error_setg_errno(errp, errno, |
| "Unable to parse FD number %s", |
| fdstr); |
| return -1; |
| } |
| } |
| if (!fd_is_socket(fd)) { |
| error_setg(errp, "File descriptor '%s' is not a socket", fdstr); |
| close(fd); |
| return -1; |
| } |
| return fd; |
| } |
| |
| int socket_address_parse_named_fd(SocketAddress *addr, Error **errp) |
| { |
| int fd; |
| |
| if (addr->type != SOCKET_ADDRESS_TYPE_FD) { |
| return 0; |
| } |
| |
| fd = socket_get_fd(addr->u.fd.str, errp); |
| if (fd < 0) { |
| return fd; |
| } |
| |
| g_free(addr->u.fd.str); |
| addr->u.fd.str = g_strdup_printf("%d", fd); |
| |
| return 0; |
| } |
| |
| int socket_connect(SocketAddress *addr, Error **errp) |
| { |
| int fd; |
| |
| switch (addr->type) { |
| case SOCKET_ADDRESS_TYPE_INET: |
| fd = inet_connect_saddr(&addr->u.inet, errp); |
| break; |
| |
| case SOCKET_ADDRESS_TYPE_UNIX: |
| fd = unix_connect_saddr(&addr->u.q_unix, errp); |
| break; |
| |
| case SOCKET_ADDRESS_TYPE_FD: |
| fd = socket_get_fd(addr->u.fd.str, errp); |
| break; |
| |
| case SOCKET_ADDRESS_TYPE_VSOCK: |
| fd = vsock_connect_saddr(&addr->u.vsock, errp); |
| break; |
| |
| default: |
| abort(); |
| } |
| return fd; |
| } |
| |
| int socket_listen(SocketAddress *addr, int num, Error **errp) |
| { |
| int fd; |
| |
| trace_socket_listen(num); |
| switch (addr->type) { |
| case SOCKET_ADDRESS_TYPE_INET: |
| fd = inet_listen_saddr(&addr->u.inet, 0, num, errp); |
| break; |
| |
| case SOCKET_ADDRESS_TYPE_UNIX: |
| fd = unix_listen_saddr(&addr->u.q_unix, num, errp); |
| break; |
| |
| case SOCKET_ADDRESS_TYPE_FD: |
| fd = socket_get_fd(addr->u.fd.str, errp); |
| if (fd < 0) { |
| return -1; |
| } |
| |
| /* |
| * If the socket is not yet in the listen state, then transition it to |
| * the listen state now. |
| * |
| * If it's already listening then this updates the backlog value as |
| * requested. |
| * |
| * If this socket cannot listen because it's already in another state |
| * (e.g. unbound or connected) then we'll catch the error here. |
| */ |
| if (listen(fd, num) != 0) { |
| error_setg_errno(errp, errno, "Failed to listen on fd socket"); |
| close(fd); |
| return -1; |
| } |
| break; |
| |
| case SOCKET_ADDRESS_TYPE_VSOCK: |
| fd = vsock_listen_saddr(&addr->u.vsock, num, errp); |
| break; |
| |
| default: |
| abort(); |
| } |
| return fd; |
| } |
| |
| void socket_listen_cleanup(int fd, Error **errp) |
| { |
| SocketAddress *addr; |
| |
| addr = socket_local_address(fd, errp); |
| if (!addr) { |
| return; |
| } |
| |
| if (addr->type == SOCKET_ADDRESS_TYPE_UNIX |
| && addr->u.q_unix.path) { |
| if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) { |
| error_setg_errno(errp, errno, |
| "Failed to unlink socket %s", |
| addr->u.q_unix.path); |
| } |
| } |
| |
| qapi_free_SocketAddress(addr); |
| } |
| |
| int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp) |
| { |
| int fd; |
| |
| /* |
| * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6 |
| * (although other address families can do SOCK_DGRAM, too) |
| */ |
| switch (remote->type) { |
| case SOCKET_ADDRESS_TYPE_INET: |
| fd = inet_dgram_saddr(&remote->u.inet, |
| local ? &local->u.inet : NULL, errp); |
| break; |
| |
| default: |
| error_setg(errp, "socket type unsupported for datagram"); |
| fd = -1; |
| } |
| return fd; |
| } |
| |
| |
| static SocketAddress * |
| socket_sockaddr_to_address_inet(struct sockaddr_storage *sa, |
| socklen_t salen, |
| Error **errp) |
| { |
| char host[NI_MAXHOST]; |
| char serv[NI_MAXSERV]; |
| SocketAddress *addr; |
| InetSocketAddress *inet; |
| int ret; |
| |
| ret = getnameinfo((struct sockaddr *)sa, salen, |
| host, sizeof(host), |
| serv, sizeof(serv), |
| NI_NUMERICHOST | NI_NUMERICSERV); |
| if (ret != 0) { |
| error_setg(errp, "Cannot format numeric socket address: %s", |
| gai_strerror(ret)); |
| return NULL; |
| } |
| |
| addr = g_new0(SocketAddress, 1); |
| addr->type = SOCKET_ADDRESS_TYPE_INET; |
| inet = &addr->u.inet; |
| inet->host = g_strdup(host); |
| inet->port = g_strdup(serv); |
| if (sa->ss_family == AF_INET) { |
| inet->has_ipv4 = inet->ipv4 = true; |
| } else { |
| inet->has_ipv6 = inet->ipv6 = true; |
| } |
| |
| return addr; |
| } |
| |
| |
| static SocketAddress * |
| socket_sockaddr_to_address_unix(struct sockaddr_storage *sa, |
| socklen_t salen, |
| Error **errp) |
| { |
| SocketAddress *addr; |
| struct sockaddr_un *su = (struct sockaddr_un *)sa; |
| |
| addr = g_new0(SocketAddress, 1); |
| addr->type = SOCKET_ADDRESS_TYPE_UNIX; |
| salen -= offsetof(struct sockaddr_un, sun_path); |
| #ifdef CONFIG_LINUX |
| if (salen > 0 && !su->sun_path[0]) { |
| /* Linux abstract socket */ |
| addr->u.q_unix.path = g_strndup(su->sun_path + 1, salen - 1); |
| addr->u.q_unix.has_abstract = true; |
| addr->u.q_unix.abstract = true; |
| addr->u.q_unix.has_tight = true; |
| addr->u.q_unix.tight = salen < sizeof(su->sun_path); |
| return addr; |
| } |
| #endif |
| |
| addr->u.q_unix.path = g_strndup(su->sun_path, salen); |
| return addr; |
| } |
| |
| #ifdef CONFIG_AF_VSOCK |
| static SocketAddress * |
| socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa, |
| socklen_t salen, |
| Error **errp) |
| { |
| SocketAddress *addr; |
| VsockSocketAddress *vaddr; |
| struct sockaddr_vm *svm = (struct sockaddr_vm *)sa; |
| |
| addr = g_new0(SocketAddress, 1); |
| addr->type = SOCKET_ADDRESS_TYPE_VSOCK; |
| vaddr = &addr->u.vsock; |
| vaddr->cid = g_strdup_printf("%u", svm->svm_cid); |
| vaddr->port = g_strdup_printf("%u", svm->svm_port); |
| |
| return addr; |
| } |
| #endif /* CONFIG_AF_VSOCK */ |
| |
| SocketAddress * |
| socket_sockaddr_to_address(struct sockaddr_storage *sa, |
| socklen_t salen, |
| Error **errp) |
| { |
| switch (sa->ss_family) { |
| case AF_INET: |
| case AF_INET6: |
| return socket_sockaddr_to_address_inet(sa, salen, errp); |
| |
| case AF_UNIX: |
| return socket_sockaddr_to_address_unix(sa, salen, errp); |
| |
| #ifdef CONFIG_AF_VSOCK |
| case AF_VSOCK: |
| return socket_sockaddr_to_address_vsock(sa, salen, errp); |
| #endif |
| |
| default: |
| error_setg(errp, "socket family %d unsupported", |
| sa->ss_family); |
| return NULL; |
| } |
| return 0; |
| } |
| |
| |
| SocketAddress *socket_local_address(int fd, Error **errp) |
| { |
| struct sockaddr_storage ss; |
| socklen_t sslen = sizeof(ss); |
| |
| if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) { |
| error_setg_errno(errp, errno, "%s", |
| "Unable to query local socket address"); |
| return NULL; |
| } |
| |
| return socket_sockaddr_to_address(&ss, sslen, errp); |
| } |
| |
| |
| SocketAddress *socket_remote_address(int fd, Error **errp) |
| { |
| struct sockaddr_storage ss; |
| socklen_t sslen = sizeof(ss); |
| |
| if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) { |
| error_setg_errno(errp, errno, "%s", |
| "Unable to query remote socket address"); |
| return NULL; |
| } |
| |
| return socket_sockaddr_to_address(&ss, sslen, errp); |
| } |
| |
| |
| SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy) |
| { |
| SocketAddress *addr; |
| |
| if (!addr_legacy) { |
| return NULL; |
| } |
| |
| addr = g_new(SocketAddress, 1); |
| |
| switch (addr_legacy->type) { |
| case SOCKET_ADDRESS_TYPE_INET: |
| addr->type = SOCKET_ADDRESS_TYPE_INET; |
| QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet, |
| addr_legacy->u.inet.data); |
| break; |
| case SOCKET_ADDRESS_TYPE_UNIX: |
| addr->type = SOCKET_ADDRESS_TYPE_UNIX; |
| QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix, |
| addr_legacy->u.q_unix.data); |
| break; |
| case SOCKET_ADDRESS_TYPE_VSOCK: |
| addr->type = SOCKET_ADDRESS_TYPE_VSOCK; |
| QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock, |
| addr_legacy->u.vsock.data); |
| break; |
| case SOCKET_ADDRESS_TYPE_FD: |
| addr->type = SOCKET_ADDRESS_TYPE_FD; |
| QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data); |
| break; |
| default: |
| abort(); |
| } |
| |
| return addr; |
| } |
